package com.topisv.tms.utils;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public abstract class UploadImageUtil {

	public static void upload(HttpServletRequest request,
			HttpServletResponse response) {

		PrintWriter out = null;

		try {
			out = response.getWriter();
		
			
		} catch (IOException e2) {
			// TODO Auto-generated catch block
			out.print("{\"status\":\"0\",\"message\":\"io error\"}");

			
		}

		final long MAX_SIZE = 3 * 1024 * 1024;// 设置上传文件最大为 3M
		// 允许上传的文件格式的列表
		final String[] allowedExt = new String[] { "jpg", "jpeg", "gif", "bmp" ,"png","JPG","JPEG"};
		File tempFile = creatFolder(request.getRealPath("/"));

		// 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
		DiskFileItemFactory dfif = new DiskFileItemFactory();
		dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
		dfif.setRepository(tempFile);// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录

		// 用以上工厂实例化上传组件
		ServletFileUpload sfu = new ServletFileUpload(dfif);
		// 设置最大上传尺寸
		sfu.setSizeMax(MAX_SIZE);

	
		// 从request得到 所有 上传域的列表
		List fileList = null;
		try {
			fileList = sfu.parseRequest(request);
		} catch (FileUploadException e) {// 处理文件尺寸过大异常
			if (e instanceof SizeLimitExceededException) {
				out.println("{\"status\":\"0\",\"message\":\"文件尺寸超过规定大小:"
						+ MAX_SIZE + "字节\"}");
				return;
			}
			
		}
		// 没有文件上传
		if (fileList == null || fileList.size() == 0) {
			out.println("请选择上传文件<p />");
			return;
		}
		// 得到所有上传的文件
		Iterator fileItr = fileList.iterator();
		int i = 0;
		// 循环处理所有文件
		while (fileItr.hasNext()) {
			FileItem fileItem = null;
			String path = null;
			long size = 0;
			// 得到当前文件
			fileItem = (FileItem) fileItr.next();
			i++;
			// 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
			if (fileItem == null || fileItem.isFormField()) {
				continue;
			}
			// 得到文件的完整路径
			path = fileItem.getName();
			// 得到文件的大小
			size = fileItem.getSize();
			if ("".equals(path) || size == 0) {
				out.println("{\"status\":\"0\":\"message\":\"请选择上传文件\"}");
				return;
			}

			// 得到去除路径的文件名
			String t_name = path.substring(path.lastIndexOf("\\") + 1);
			// 得到文件的扩展名(无扩展名时将得到全名)
			String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
			// 拒绝接受规定文件格式之外的文件类型
			int allowFlag = 0;
			int allowedExtCount = allowedExt.length;
			for (; allowFlag < allowedExtCount; allowFlag++) {
				if (allowedExt[allowFlag].equals(t_ext))
					break;
			}
			if (allowFlag == allowedExtCount) {
				out.println("请上传以下类型的文件<p />");
				for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
					out.println("{\"status\":\"0\",\"message\":\"*."
							+ allowedExt[allowFlag] + "&nbsp;&nbsp;&nbsp;\"}");
				return;
			}
			try {
				// 保存文件
				String fileName = SystemUtil.getUUid();
				File saveFile = new File(tempFile.getPath(), fileName + "."
						+ t_ext);
				fileItem.write(saveFile);
				String basePath=FileOperation.getPath();
				String message = saveFile.getPath()
						.replace(request.getRealPath("/"), basePath)
						.replace("\\", "/");
				out.println("{\"status\":\"1\",\"message\":\"" + message
						+ "\"}");
			} catch (Exception e) {
				out.println("{\"status\":\"0\",\"message\":\"error\"}");
				
			}

		}
	}

	public static void main(String[] args) {
		String path = "d:/";
		File file = creatFolder(path);
	}

	/**
	 * 检测与创建一级、二级文件夹、文件名 这里我通过传入的两个字符串来做一级文件夹和二级文件夹名称
	 * 通过此种办法我们可以做到根据用户的选择保存到相应的文件夹下
	 */
	private static File creatFolder(String path) {
		String fileName = SystemUtil.getUUid();
		File file = new File(path);
		if (file.exists()) {
			file = new File(file.getPath(), SystemUtil.file_static);
			if (file.exists()) {
				file = new File(file.getPath(), SystemUtil.file_uploadImage);
				if (file.exists()) {
					file = new File(file.getPath(),
							SystemUtil.file_exepress_style);
				}
			} else {
				file.mkdir();
				file = new File(file.getPath(), SystemUtil.file_uploadImage);
				file.mkdir();
				file = new File(file.getPath(), SystemUtil.file_exepress_style);
				file.mkdir();
			}
		}

		return file;
	}
}
